Logical volume migration

Dear All,
I have volume group that contain SAP data instead of 4 physical disk. i have 4 new disk (same size) with existing disk. What are u suggestion if i want to move SAP data to 4 new disk? use logical volume copy (mklvcopy) or any other mechanism? Please advice?
best regards
Dony Prasetyo
AIX System Engineer
Intikom, PT Jakarta - Indonesia

migratepv is safe.
but:
please keep an eye on the SAP's requirements and recommendations regarding the filesystems.
please note that migratepv creates huge I/O load on the LUNs. So no application stop needed, but performance degradation will occur.

Hi Don,
You have a volume group with 4 disks and want to replace them with new
disks? That's quite easy:
1- add the new disks to the volume group by "extendvg yourvg hdiskN"
2- migrate the data from old disks to new disks one by one: # migratepv
hdisk5 hdisk6 (this will move all logical volumes from hdisk5 to hdisk6)
3- when migration of old disks is completed, make sure there is nothing in
them: # lspv -l hdisk5
4- remove the old disks from VG: # reducevg yourvg hdisk5
.
Mehdi

Hi Mehdi,
it's secure to migrate all data on its volume group? i mean, is it possible for data outage? how about lv copy, if any data inconsistency occured. i could go back to original data. Thanks for your suggestion.
Dony Prasetyo
AIX System Engineer

Right, performance degradation will certainly occur and if
applications are busy, migratepv will take lots of time to complete.
The recommended way is stopping the applications and un-mounting
filesytems. A full 73GB 10k SCSI disk takes less than 30 minutes to
be migrated.
.
Mehdi